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ASoC: fsl_utils: Add function to constrain rates

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Platforms like i.MX93/91 only have one audio PLL. Some sample rates are
not supported. Add common function to constrain rates according to
different clock sources.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Link: https://patch.msgid.link/20241126115440.3929061-2-chancel.liu@nxp.com
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chancel Liu
2024-11-26 20:54:37 +09:00
committed by Mark Brown
parent 5757b31666
commit 820bcaeb1f
2 changed files with 50 additions and 0 deletions
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45
sound/soc/fsl/fsl_utils.c
View File

@@ -152,6 +152,51 @@ void fsl_asoc_reparent_pll_clocks(struct device *dev, struct clk *clk,
}
EXPORT_SYMBOL(fsl_asoc_reparent_pll_clocks);
/**
* fsl_asoc_constrain_rates - constrain rates according to clocks
*
* @target_constr: target constraint
* @original_constr: original constraint
* @pll8k_clk: PLL clock pointer for 8kHz
* @pll11k_clk: PLL clock pointer for 11kHz
* @ext_clk: External clock pointer
* @target_rates: target rates array
*
* This function constrain rates according to clocks
*/
void fsl_asoc_constrain_rates(struct snd_pcm_hw_constraint_list *target_constr,
const struct snd_pcm_hw_constraint_list *original_constr,
struct clk *pll8k_clk, struct clk *pll11k_clk,
struct clk *ext_clk, int *target_rates)
{
int i, j, k = 0;
u64 clk_rate[3];
*target_constr = *original_constr;
if (pll8k_clk || pll11k_clk || ext_clk) {
target_constr->list = target_rates;
target_constr->count = 0;
for (i = 0; i < original_constr->count; i++) {
clk_rate[0] = clk_get_rate(pll8k_clk);
clk_rate[1] = clk_get_rate(pll11k_clk);
clk_rate[2] = clk_get_rate(ext_clk);
for (j = 0; j < 3; j++) {
if (clk_rate[j] != 0 &&
do_div(clk_rate[j], original_constr->list[i]) == 0) {
target_rates[k++] = original_constr->list[i];
target_constr->count++;
break;
}
}
}
/* protection for if there is no proper rate found*/
if (!target_constr->count)
*target_constr = *original_constr;
}
}
EXPORT_SYMBOL(fsl_asoc_constrain_rates);
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
MODULE_DESCRIPTION("Freescale ASoC utility code");
MODULE_LICENSE("GPL v2");

5
sound/soc/fsl/fsl_utils.h
View File

@@ -26,4 +26,9 @@ void fsl_asoc_get_pll_clocks(struct device *dev, struct clk **pll8k_clk,
void fsl_asoc_reparent_pll_clocks(struct device *dev, struct clk *clk,
struct clk *pll8k_clk,
struct clk *pll11k_clk, u64 ratio);
void fsl_asoc_constrain_rates(struct snd_pcm_hw_constraint_list *target_constr,
const struct snd_pcm_hw_constraint_list *original_constr,
struct clk *pll8k_clk, struct clk *pll11k_clk,
struct clk *ext_clk, int *target_rates);
#endif /* _FSL_UTILS_H */